Offline AC/DC 77W Quasi-Resonant Flyback Converter Reference Design
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Key Document


The PMP10121 reference design uses the UCC28600 quasi-resonant flyback controller to generate 22V @ 3.5A from an AC input. This flyback converter is not isolated and no optocoupler is needed for regulation.

  • Quasi-Resonant Flyback Topology
  • Four Point Average Efficiency  = 90.3% (Vin=230VAC)
  • 10% Load Efficiency = 89% (Vin=230VAC)
  • No Need For an Optocoupler
  • This reference design was built and tested and the test report is included

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)165
Vin (Max) (V)275
Vout (Nom) (V)22
Iout (Max) (A)3.5
Output Power (W)77
Input TypeAC
TopologyFlyback- Quasi Resonant

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMV431A  1%, low-voltage (1.24-V) adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
UCC28600  8-pin quasi resonant Flyback green mode controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMV431A Download Download
Download Download
UCC28600 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1409 31 Jul 2015
Design files (3)
Title Type Size (KB) Date
ZIP 383 31 Jul 2015
PDF 136 31 Jul 2015
PDF 311 31 Jul 2015

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